public function getCSVColumns()
{
$q = parent::getCSVColumns();
if (empty($this->subquestions)) {
return $q;
}
$a = array();
for ($k = 0; $k < count($this->subquestions); $k++) {
$a[$k] = $q . ' : ' . $this->subquestions[$k];
}
return $a;
}
